System for verifying the accuracy of lens holder attachment, lens attachment stage, and lens processing system

Abstract

A system comprises the step for applying a mark in advance in a reference position in which attachment of a lens holder is anticipated on a convex lens surface of a reference lens; the step for attaching the lens holder to the convex lens surface of the reference lens by using a holder attachment apparatus; and the step for comparing a position in which the lens holder is actually attached and a reference position in which the mark is applied on the lens. A cavity-shaped hole is formed in the holder so that a position of the mark on the reference lens can be observed when the lens holder is attached to the lens. In the comparison step, a toolmaker's microscope is used to observe the mark through the hole in the lens holder from a direction of the convex lens surface of the lens, an actual attachment position of the holder is compared to the reference position of the reference lens, and an attachment accuracy of the holder is verified.

1. A system for verifying accuracy of lens holder attachment, comprising:
 a marking step for applying a mark in advance in a reference position in which attachment of a lens holder is anticipated on a convex lens surface of a reference lens when the lens holder is attached to the reference lens; 
 an attachment step for attaching said lens holder to the convex lens surface of said reference lens by using a lens holder attachment apparatus; and 
 a comparison step for comparing a position in which the lens holder is actually attached and a reference position in which said mark is applied on said reference lens; wherein 
 a cavity-shaped hole is formed in said lens holder so that a position of said mark on said reference lens can be observed when the lens holder is attached to said reference lens; and 
 a toolmaker's microscope is used in the comparison step to observe said mark through said cavity-shaped hole in said lens holder from a direction of said convex lens surface of said reference lens, an actual attachment position of said lens holder is compared to said reference position of said reference lens, and an attachment accuracy of said lens holder is verified. 
 
   
   
     2. The system for verifying accuracy of lens holder attachment according to  claim 1 , further comprising a setting step for setting a geometric center of the lens holder so as to coincide with an actual attachment position of the lens holder in the comparison step when the lens holder is attached to said reference lens. 
   
   
     3. The system for verifying accuracy of lens holder attachment according to  claim 2 , wherein
 a lens attachment stage is mounted on a measurement stage of a toolmaker's microscope in the setting step so that a geometric center position of a lens holder coincides with an actual attachment position in the comparison step; and 
 the lens attachment stage is provided with a first hole for retaining said lens holder. 
 
   
   
     4. The system for verifying accuracy of lens holder attachment according to  claim 3 , wherein said setting step comprises
 fitting a fixture having a geometric center and an outside diameter that is the same as an outside diameter of said lens holder into said first hole so that a geometric center position of a lens holder retained in the first hole of a lens attachment stage coincides with a center of a field of view of the toolmaker's microscope; and 
 adjusting the toolmaker's microscope so that a geometric center position of the fixture coincides with a center of a field of view of said toolmaker's microscope. 
 
   
   
     5. The system for verifying accuracy of lens holder attachment according to  claim 3 , wherein said marking step comprises marking an optical center position of a monofocal lens as a reference position when the reference lens is a monofocal lens. 
   
   
     6. The system for verifying accuracy of lens holder attachment according to  claim 3 , wherein said marking step comprises marking a center position of two hidden marks on a progressive multifocal lens, or an eyepoint position at a prescribed distance from a center position of the hidden marks as a reference position when the reference lens is a progressive multifocal lens. 
   
   
     7. The system for verifying accuracy of lens holder attachment according to  claim 3 , wherein said marking step comprises marking a segment top position of a multifocal lens, or an eyepoint position at a prescribed distance from the segment top position as a reference position when the reference lens is a multifocal lens. 
   
   
     8. The system for verifying accuracy of lens holder attachment according to  claim 2 , wherein said setting step comprises
 fitting a fixture having a geometric center and an outside diameter that is the same as an outside diameter of said lens holder into said first hole so that a geometric center position of a lens holder retained in the first hole of a lens attachment stage coincides with a center of a field of view of the toolmaker's microscope; and 
 adjusting the toolmaker's microscope so that a geometric center position of the fixture coincides with a center of a field of view of said toolmaker's microscope. 
 
   
   
     9. The system for verifying accuracy of lens holder attachment according to  claim 8 , wherein said marking step comprises marking an optical center position of a monofocal lens as a reference position when the reference lens is a monofocal lens. 
   
   
     10. The system for verifying accuracy of lens holder attachment according to  claim 8 , wherein said marking step comprises marking a center position of two hidden marks on a progressive multifocal lens, or an eyepoint position at a prescribed distance from a center position of the hidden marks as a reference position when the reference lens is a progressive multifocal lens. 
   
   
     11. The system for verifying accuracy of lens holder attachment according to  claim 8 , wherein said marking step comprises marking a segment top position of a multifocal lens, or an eyepoint position at a prescribed distance from the segment top position as a reference position when the reference lens is a multifocal lens. 
   
   
     12. The system for verifying accuracy of lens holder attachment according to  claim 2 , wherein said marking step comprises marking an optical center position of a monofocal lens as a reference position when the reference lens is a monofocal lens. 
   
   
     13. The system for verifying accuracy of lens holder attachment according to  claim 2 , wherein said marking step comprises marking a center position of two hidden marks on a progressive multifocal lens, or an eyepoint position at a prescribed distance from a center position of the hidden marks as a reference position when the reference lens is a progressive multifocal lens. 
   
   
     14. The system for verifying accuracy of lens holder attachment according to  claim 2 , wherein said marking step comprises marking a segment top position of a multifocal lens, or an eyepoint position at a prescribed distance from the segment top position as a reference position when the reference lens is a multifocal lens. 
   
   
     15. The system for verifying accuracy of lens holder attachment according to  claim 1 , wherein said marking step comprises marking an optical center position of a monofocal lens as a reference position when the reference lens is a monofocal lens. 
   
   
     16. The system for verifying accuracy of lens holder attachment according to  claim 1 , wherein said marking step comprises marking a center position of two hidden marks on a progressive multifocal lens, or an eyepoint position at a prescribed distance from a center position of the hidden marks as a reference position when the reference lens is a progressive multifocal lens. 
   
   
     17. The system for verifying accuracy of lens holder attachment according to  claim 1 , wherein said marking step comprises marking a segment top position of a multifocal lens, or an eyepoint position at a prescribed distance from the segment top position as a reference position when the reference lens is a multifocal lens. 
   
   
     18. The system for verifying accuracy of lens holder attachment according to  claim 1 , further comprising a mark observation step for applying at least two marks for indicating an axis line of the reference lens on both sides of a reference position in a convex lens surface of said reference lens, and observing said marks from a direction of said convex lens surface by using a toolmaker's microscope to verify an attachment accuracy about an axis of a lens holder attached to said convex lens surface of said reference lens. 
   
   
     19. A lens processing system wherein the system for verifying accuracy of lens holder attachment according to  claim 1  is used to perform a lens holder attachment step for attaching a lens holder to an untreated eyeglass lens by using said lens holder attachment apparatus, and a grinding/cutting step for performing at least one of grinding and cutting of the untreated eyeglass lens after an attachment accuracy of the lens holder in the lens holder attachment apparatus is verified and the attachment accuracy is satisfactory. 
   
   
     20. A lens attachment stage for attaching said reference lens via a lens holder attached to a convex lens surface of a reference lens; said lens attachment stage comprising:
 a first hole designed to retain the lens holder and provided with the same diameter as an outside diameter of said lens holder; and 
 at least two second holes provided in positions that correspond to marks applied so as to indicate an axis line of said reference lens; wherein 
 said convex lens surface of said reference lens can be observed by a toolmaker's microscope using a lens holder retained by said first hole.